Hello,
in which file of the IDE can I find where the TCA ISRs are used?
I would like to look up what is being done in ISR.
Hi,
forget the question. 
Had wondered why the IDE uses the TCA ISR even though the PWM pins use the WOn because I was getting redefinition errors. But that's because I had all TCA ISRs in the code for testing and 4 of them point to the same vector. The mystery is solved. That's why I couldn't find the ISRs in the IDE files, because simply not used.
// TCA0 interrupt vectors //
#define TCA0_LUNF_vect _VECTOR(7)
#define TCA0_OVF_vect _VECTOR(7)
#define TCA0_HUNF_vect _VECTOR(8)
#define TCA0_CMP0_vect _VECTOR(9)
#define TCA0_LCMP0_vect _VECTOR(9)
#define TCA0_CMP1_vect _VECTOR(10)
#define TCA0_LCMP1_vect _VECTOR(10)
#define TCA0_CMP2_vect _VECTOR(11)
#define TCA0_LCMP2_vect _VECTOR(11)
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